Cryptic crossword No 3,486

Across

1. Around middle of recital, tear into shaky cover of someone else's song (9)
2. Traces of Will's narcissism seen principally in Hamlet (4)
3. Hesitation after initially hefty fine is nonsense (5)
4. Group travelling through Austria dismissed (5)
5. Turn back on England, dwelling in concerning times (2-6)
6. Gent angling for a seafood dinner? (9)
7. Life challenges cause us situationally to withdraw somewhat (6)
8. Letter from Patras - unknown when it should arrive (4)
9. Security rejected X for precautionary measures (6,3)
10. Left-hand side of equation followed by less-than sign at first, replaced by this when balanced? (6)
11. Sound of percussion instrument is primarily musical metaphor (9)
12. Debate Republican in the midst of illness (5)
13. Threescore and nine in pigpen (5)
14. Note found on the French road by base of archway - mind reading? (9)
15. Coaxing sweetheart to dive into destiny after losing heart (8)
16. Reportedly fly by dwarf planet with Romulans' leader on board - they can make magic happen (9)

Down

1. Turning collection of books into strange abrupt conclusion of story (6)
2. Foolish trust I've placed in senate to expel leading duo (7)
3. Contemptuous Kolkata resident bottles up agony regularly over time (9)
4. Saint following directions to get home (4)
5. In silence, martial artist flips and strikes with a roundhouse (5)
6. At bottom of backpack, you may originally spot bite-sized fruit (7)
7. Ascending mountain, rip second bit of rucksack for protective gear (5,5)
8. With brothers at heart, Finn and Gigi raucously quarreling amongst themselves (10)
9. Deposits emptied in quarry - you once could see amazing things here (5,3)
10. Assistant carrying a treasurer's coat supported by financial backing (9)
11. Evaluates some curved letters like another one is leading (8)
12. Confound male doctor in unsteady state (7)
13. Squirm with costume covering broken leg (7)
14. Bird almost lands on ship's door (6)
15. Join up with head of Yakuza? That's crazy! (5)
16. Struggles with cinema starting at 5 (4)